[Ergonomic Design] Perfect office chair cushion, 100% memory foam cushion helps relieve the pressure while driving or sitting for long periods. The ergonomically designed "u" shaped cutout keeps your coccyx suspended above hard seat surface, relieving pressure all along the back, tailbone and legs. It also helps promote healthy posture. [Ergonomic Design] Perfect office chair cushion, 100% memory foam cushion helps relieve the pressure while driving or sitting for long periods. The ergonomically designed "u" shaped cutout keeps your coccyx suspended above hard seat surface, relieving pressure all along the back, tailbone and legs. It also helps promote healthy posture. [Ergonomic Design] Perfect office chair cushion, 100% memory foam cushion helps relieve the pressure while driving or sitting for long periods. The ergonomically designed "u" shaped cutout keeps your coccyx suspended above hard seat surface, relieving pressure all along the back, tailbone and